True dual-stage spring rate Aluminum body and shock cap Infinite spring pre-load adjustment Beefy 3.5mm shock shafts Injection-molded, super durable spring retainer and shock ends Bladder sealed shock cap Free-flow molded pistons Dual O-ring seats and upper and lower shock shaft guides Pre-assembled - just add oil Fits stock Slash - ProTrac Suspension Kit for Slash and Slash 4X4 Overview Enhance the overall performance of your stock Slash and Slash 4X4 or your ProTrac Suspension Kit Slash with PowerStroke Shocks. What's included: Pre-assembled PowerStroke Performance Shocks Front (2 pcs)